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I also had that happen twice to my 1990 735iL
In my case it was due to defects in the following parts, they were old and worn out. The root of the problem was the water pump and the water hose.
EXCHANGE WATER PUMP
CORE RETURN
WATER PUMP GASKET
V-BELT 13X1040
V-BELT 13X855
FAN BELT 10X865
Check the radiator hoses too. In winter they can get exposed to all kinds of filth and corruption, causing them to rot.
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